KR960013352B1 - Suction & exhaust valve opening controlling apparatus of a car - Google Patents

Abstract

The apparatus connects the timing gear provided in a crankshaft and the timing gear provided in a cam shaft(1) by means of a timing chain, so as to control a suction and exhaust valve opening time in accordance with rotation of the crankshaft. The apparatus includes: a cam(4), in which a slider(3) is inserted to slide in the rotation and shaft direction, and a lobe(4A) is twisted at a specific angle( M) to selectively control the opening time; a cylinder(7) having a piston(6) at one side of slider(3), to perform the rectilinear reciprocating motion; and a solenoid valve(11) that is in communication with a hydraulic pump(9) and an accumulator(10), and connected electrically with ECU(8), to selectively switch an oil passage.

Description

Adjusting device for opening / closing the intake and exhaust valve of car

1 is a side cross-sectional view showing the configuration of an intake / exhaust valve opening / closing timing adjusting device for an automobile according to the present invention.

2 is a perspective view of a cam according to this invention.

(A) and (b) are front and back views of FIG.

* Explanation of symbols for the main parts of the drawings

1: Camshaft 3: Slider

4: cam 4a: lobe

5: bearing 6: piston

7: cylinder 8: ECU

9: hydraulic pimp 10: accumulator

11: solenoid valve a: angle

The present invention relates to a device for adjusting the opening and closing time of an intake and exhaust valve of a vehicle, and more particularly, to enable the opening and closing at an optimum valve opening and closing time according to engine conditions, thereby increasing the volumetric efficiency of the inhaled mixer. It relates to an intake and exhaust valve opening and closing timing control device.

In general, four-cycle engines are provided with one or two intake valves and two exhaust valves in one cylinder to draw a mixer necessary for power stroke into a combustion chamber and to discharge combustion gas to the outside.

These intake and exhaust valves easily intake and exhaust in the extremely short period of time when Piston operates one cycle, increasing the optimum efficiency, while maintaining sufficient air tightness in the compression and power strokes in which both valves are closed, as well as exposing to high temperatures of the combustion gases. Even if it is, it must be operated correctly and must satisfy each condition such as enduring long time of unwinding.

The valve opening and closing device for accurately opening and closing the intake and exhaust valves at a predetermined time is

The push rod is pushed through a valve lift that is in surface contact with the cam of the cam shaft, which pushes the rocker arm to overcome the elastic force of the elastic member and selectively opens and closes by pressing the valve stem and crankshaft. And the cam cam of the cam shaft connected by the timing valve or the timing chain directly to the rocker arm to open and close the valve selectively. The overhead valve type has a low suction and exhaust flow resistance as well as suction, Since the exhaust efficiency is good and the shape of the combustion chamber can be produced in a simple shape, a high compression ratio can be formed and knocking can be prevented, so it is widely used.

In addition, there is a disadvantage in that the structure of the cylinder head is complicated because a chain or a belt for driving an overhead camshaft camshaft must be installed, but the inertia force of the reciprocating portion of the valve mechanism is small, so the acceleration of the valve can be increased. Since stable valves can be opened and closed, the high speed performance can be improved, and the rapid rotation from the low speed to the high speed can be enhanced, which is advantageous in terms of performance.

The valve opening and closing device is engraved with a timing microphone for timing the valve opening and closing on the timing gear provided on the crankshaft and the timing gear provided on the camshaft. Keep the timing accurate.

Therefore, the intake valve can be opened just before the end of the exhaust stroke and closed after having the bottom dead center of the intake stroke, so that the mixer can be sucked into the cylinder as much as possible using the intake inertia.

In addition, the exhaust valve is opened before the end of the power stroke, that is, before the bottom dead center, to discharge the combustion gas out of the cylinder, and to exhaust the exhaust gas after the exhaust stroke is finished, just before the intake stroke starts, that is, after the top dead center.

Therefore, the output is increased by increasing the volumetric efficiency of the mixer by opening both exhaust valves at the end of the exhaust shaping and at the start of the intake stroke, but when the timing chain or timing belt connecting the crankshaft and camshaft is relaxed, Since the opening and closing time of the exhaust valve is not accurate, the volumetric efficiency is lowered and the output of the engine is lowered, and each valve is opened and closed according to the rotation of the crankshaft. There is a problem that the output is reduced because the valve can not be opened and closed.

The present invention has been invented to solve the conventional problems as described above, an object of the present invention is to enable the opening and closing of the valve at the time of opening and closing the valve according to the conditions of the number of revolutions, load, cooling water temperature, etc. of the engine mixer It is to provide a device for controlling the opening and closing time of the intake and exhaust valves of a vehicle that can increase the output of the engine by increasing the filling efficiency.

In order to realize this, the present invention provides a vehicle intake and exhaust valve in which a timing gear provided on the crankshaft and a timing gear provided on the camshaft are connected to the timing chain so that the opening and closing times of the intake and exhaust valves are adjusted according to the rotation of the crankshaft. In the opening and closing timing adjusting device, the cam shaft and the spline are coupled to the slider to be pushed in the rotational and axial direction so as to slide and the lobe is twisted at a predetermined angle about the central axis to selectively adjust the opening and closing timing. A cylinder having a cam, a piston having a piston installed on one side of the slider for linear reciprocating motion without rotating the bearing, and communicating with both sides of the cylinder, and the engine rotation speed, load, cooling water temperature, etc. ECU which outputs output signal selectively according to the condition ) Is communicated via the accumulator of the hydraulic pampeu actuated by the output signal and connected to the ECU and the electrical provides selectively intake of the car consisting of a solenoid valve for switching the flow path, the exhaust valve opening and closing timing control device.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a side cross-sectional view showing the configuration of an intake / exhaust valve opening / closing timing adjusting device for an automobile of the present invention, and FIG. 2 is a perspective view of a cam according to the present invention, and FIG. 3 (a) and (b) are second As front and rear views of the figure, reference numeral 1 designates a camshaft.

The cam shaft 1 is supported on both sides by a bearing 2, and the timing gear of the crankshaft (1) and the timing gear of the camshaft 1 which are not shown on one side thereof are connected to each other by a timing chain, and according to the rotation of the crankshaft. The camshaft 1 is made to rotate.

On the outer circumference of the cam shaft 1, the slider 3 coupled to the spline is inserted into the outer periphery of the cam shaft 1, and the lobe 4a is twisted at a predetermined angle a about the central axis. (4) is installed in the same number as the intake and exhaust valves (not shown), the surface contact with one side of the rocker arm (L) in contact with the intake and exhaust valve stem end, thereby adjusting the valve opening and closing timing according to the rotation of the crankshaft It is supposed to be.

The cylinder 7 which has the piston 6 provided so that only linear reciprocation may be carried out without rotation through the bearing 5 on one side of the said slider 3 is fixed so that tightness may be maintained.

Both sides of the cylinder 7 are in communication with each other, and the ECU 8 which selectively outputs the output signal according to the output signal of each sensor (not shown) which detects the engine rotation speed, load, cooling water temperature, and the like. The solenoid valve 11 which is installed in communication via the hydraulic pump 9 and the accumulator 10 connected to each other, and electrically connected to the ECU 8 to selectively switch the flow path is provided to control the ECU 8. Oil is selectively supplied to both sides of the cylinder 7, and the cam 4 is linearly reciprocated by the guide of the slider 3 provided on the cam shaft 1 so that the opening and closing time of the intake and exhaust valves is optimal. By adjusting the power output of the engine is increased.

In the figure, reference numeral 12 denotes a return tank in which oil returned from the cylinder 7 is stored via the solenoid valve 11.

The intake / exhaust valve opening / closing timing adjusting device of the vehicle of the present invention configured as described above has a high speed in comparison with the set value memorized in the ECU 8 according to the output signal of the sensor for detecting the engine speed, load, cooling water temperature and the like. When it is determined that the high load, the hydraulic pump 9 and the solenoid valve 11 to output the output signal electrically.

Therefore, the hydraulic pump 9 pumps the oil stored in the accumulator 10 and at the same time the solenoid valve 11 is controlled so that the oil pumped through the ports a and c is supplied to the left side of the cylinder 7 as shown in the drawing. The slider 3 slides to the right.

As the slider 3 slides, the cams 4 slide together so that the rocker is locked by the lobe 4a which is twisted at a predetermined angle a as shown by the solid line in the dashed line in FIG. As the arm L is contacted at an early stage, as shown by the dashed-dotted line, the opening and closing time of the intake and exhaust valves is adjusted to the optimum state according to the conditions of the engine, thereby increasing the volumetric efficiency and increasing the output of the cylinder (7). Oil remaining on the right side of) is returned to the return tank 12 via the d and b ports of the solenoid valve 11.

In this state, when the respective conditions of the engine are reversed, the ECU 8 controls the solenoid valve 11 in comparison with the stored set value to switch the flow path so that the oil pumped by the hydraulic pump 9 is discharged from the solenoid valve 11. The cam 4 is supplied to the right side of the cylinder 7 via ports a and d, and at the same time, the cam 4 is operated in the opposite direction to the electrical operation to adjust the opening and closing timing of the intake and exhaust valves to an optimum state according to the engine condition. By increasing the volumetric efficiency, the output of the engine is increased, and the oil remaining on the left side of the cylinder 7 is returned to the return tank 12 via the c and d ports of the solenoid valve 11.

As described above, the intake / exhaust valve opening / closing timing adjusting device of the vehicle of the present invention provides an optimum state of opening / closing time of the intake / exhaust valves under the control of the ECU according to the engine rotation speed, load, cooling water temperature and the like. Since it is possible to variably control the furnace has the advantage of increasing the output of the engine by increasing the volumetric efficiency of the filling of the mixer.

Claims (1)

The timing gear provided on the crankshaft and the timing gear provided on the camshaft 1 are connected to the timing chain to adjust the opening and closing time of the intake / exhaust valve opening / closing device of the vehicle, wherein the opening and closing timing of the intake and exhaust valves is adjusted according to the rotation of the crankshaft. In this case, the glider 4A is splined to the camshaft 1 and slidably rotated and slidable in the axial direction, and the lobe 4A has a predetermined angle about the central axis so that the opening and closing time is selectively adjusted. a cylinder (7) having a cam (4) twisted by (a), a piston (6) interposed on one side of the slider (3) and installed to perform a linear reciprocating motion without rotation, and the cylinder (7) Is installed in communication with both sides of the engine and is operated by the output signal of the ECU (8) that selectively outputs the output signal according to the engine's rotational speed, load, cooling water temperature, etc. Intake / exhaust valve opening and closing of a vehicle, which is connected via a pressure pump 9 and an accumulator 10, and electrically connected to the ECU 8 to be connected to a solenoid valve 11 for selectively switching flow paths. Timing device.